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NCP1205 Datasheet(PDF) 5 Page - ON Semiconductor

Part # NCP1205
Description  Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
PDF  17 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1205 Datasheet(HTML) 5 Page - ON Semiconductor

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NCP1205
http://onsemi.com
5
Figure 4. Internal Circuit Architecture for PDIP−14 Version
3
4
−
+
−
+
Internal Regulator
Internal Clamp
DEMAG ?
Last Pulse of Demag
after 4 ms
Flip−Flop
Lasts more than 128 ms?
−−> Protection Circuitry
VCO Feedback
Toff = f (Verr)
Max Toff = f (Ct)
Over Current
Protection (OCP)
V(−) < 1.5 V
Verr Max = 3 V
Verr Min = 10 mV
Internal VCC
Ri
Rf
1
5
200 ns L.E.B
2.5 V
1/3
−
+
14
Clock
RQ
D
Driver
Current Comparator
HV
Demag
FB
Ct
VCC
DRV
Isense
GND
Startup
UVLOH = 15 V
UVLOL = 7.2 V
1 V
Verr
2
7
6
13
12
11
10
8
9
2.0 k
OVP
−
+
OVP
2.8 V
18 k
VCC Pin 13
NC
NC
OVP
NC
NC



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